Godaddy A record to digitalocean I.P. address

Once I point my GoDaddy A record to my I.P. address on my server, what changes do I have to make to my server? GoDaddy handles my mail, so I cant change the Nameserver. I've got multiple sites on my DO server. Would I need to change my host files? What records/files on the DO end do I need to make?

The Apache web server is the most popular way to serve web content on the internet. Apache has the ability to serve multiple domains from a single server by using a mechanism called "virtual hosts". If a virtual host is configured correctly for each domain, the web server can correctly route traffic to the appropriate files based on the domain name requested. In this guide, we'll demonstrate how to configure Apache virtual hosts on an Ubuntu 16.04 server.